The conditions for the validity of the proxy will are as follows:

1. The power of attorney shall be dictated by the decedent and written by one of the witnesses.

2. There must be more than two witnesses in the book will, and one witness can be the book representative;

3, can't find the following three kinds of people to act as witnesses of the will, otherwise it may lead to the agency will be invalid:

(1) Persons without or with limited capacity for civil conduct;

(2) Heirs and legatees;

(3) People who have an interest in the heirs and legatees;

The testator should be present to witness the whole process of making a will.

5. The agent, other witnesses and testator all need to sign the will;

6. The agent's will must indicate the year, month and day. If you can't write your own name, you can use stamp or stamp instead of signature.

A legally binding will must meet the following conditions:

1, the testator must have testamentary capacity;

2. The will must be the true meaning of the testator;

3. The contents of the will must be legal;

4. The form of will must meet the requirements stipulated by law.

The legal and effective forms of making a will are as follows:

1, decedent's death certificate;

2. If the will is notarized, the notarized certificate of the notary office shall be submitted;

3. If an agent is entrusted to write a will, the will written by the agent shall be submitted. You can also apply to entrust an agent to testify in court;

4. If the will is written by myself, a will written by the testator, signed by the testator and marked with specific time shall be submitted. If there is a witness, it shall apply for the witness to testify in court. In addition, professional inheritance lawyers suggest that the parties who submit their wills should prepare some testator's handwriting for the court and the other party to compare and provide reference;

5. If a will is made by recording, the recording materials shall be submitted and two or more disinterested witnesses shall be provided. A witness shall apply to testify in court;

6. An oral will shall have two or more disinterested witnesses. A witness shall apply to testify in court.

To sum up, the will written by proxy refers to the will written by others because the testator can't write. There must be more than two witnesses present, indicating the year, month and day, and signed by the agent, other witnesses and the testator.

Legal basis:

Article 134th of the Civil Code of People's Republic of China (PRC)

A self-made will is written and signed by the testator, indicating the year, month and day.

Article 135

A will that entrusts others to write on behalf of others shall be witnessed by two or more witnesses, and one of them shall write on behalf of others, which shall be signed by the testator, agent and other witnesses, and marked with the year, month and day.

Article 143

A will made by a person without or with limited capacity for civil conduct is invalid.

A will must express the true meaning of the testator, and a will made by fraud or coercion is invalid.

Forged wills are invalid.

If the will is tampered with, the tampered contents are invalid.